Apparatus for molding articles under high pressure



Dec. 7 1926.

, W. S. BUTTLES APPARATUS FOYR MOLDING ARTICLES 'UNDER HIGH PRESSURE Filed Jan'. 28, 1925 2 Sheets-Sheet i //7Ve/77br 214M775 Bu/776:5 1 W- Dec. 7 1926. 1,609,469

I w. s. BUTTLES APPARATUS FOR MOLDING ARTICLES UNDER HIGH PRESSURE Fn d' Jan. 28 1925 2 Sheets-Sheet 2 Wye/7b) 1477/4/1 Bums.

Patented/Dec. 7, 1926.

WILLIAM STEVENS BUTTLES, OF CHICAGO, ILLINOIS, ASSICNOR TO WESTERN ELEC-' TBIC COMPANY, INCORPORATED, OF NEW YORK, 'N.' Y.', A CORPORATION OF NEW YORK.

APPARATUS FOR MOLDING ARTICLES HIGH PRESSURE.

Application filed January 28, 925. Serial m. 5,224.

This invention relates to improved apparatus for molding articles under high pres? sures, and hasfor its primary object the .provision of apparatus of the character de' scribed, in which articles, that because of their form have beenmolded in sections heretofore, can each bemolded in a single pressing operation, and from which the molded articles can be quickly and easily removed.

In one embodiment of the invention, hy-

dra'ulic' pressure'is applied to two forming members iwhichin turn apply pressure to finely divided ma etic material disposed within an annular ie and form the material 15 into a magnet core, the die comprisin a i plurality of separable segments removahly seated in a tapered aperturewhich is formed in a holder. The forming members are disposed in opposed relation and blocks of rub- 20 her interposed between one of them and the holder unbalance the pressure exerted upon the magnetic material to such an extent that relative movement between the annular die and its holder is prevented.

Other objects and features of the invention will become apparent asthe following detailed description progresses, reference being had. to the accompanying drawings, wherein Q a 1 Fig. 1 is a plan view of one. rtion of an apparatus which embodies t e invention; Fig. 2 is a central section through the apparatus; Fig. 3'is a central section taken on the 35 the1 apparatus shown in changed positions, an Fig. 4 is a section taken on line 4-4 of Fig. 1.

In the drawings, and 11 are upper and lower. platens, respectively, of a hydraulic press, the lower platen 11 being mounted upon a ram 12. 15 is a base plate-resting upon the lower platen 11 and having a central aperture 17 in which is seated a punch or forining member'18. Threadedin and projecting upwardly from the base plate 15 are bolts 20 and guide pins 21.

same line as Fig. 2 but with certain parts of The bolts 20 and guide pins 21 pass through apertures 23 formed in a plate 25 disposed above the'base plate 15 and held in spaced relation with respect thereto by collars 27 ofrubber or any other suitable material. The'collars 27 are held in position between the plate 25 and the base plate 15 by the 55 bolts 20 and the guide pins 21, the-collars27 being provided with central apertures 29 to receive the bolts and the guide pins. Seated in a central aperture 30 formed in the plate 25 and having a shoulder 32 resting upon the plate 25'is' a dieholder 34 having a centraltapered aperture 36. Seated in the tapered aperture 36 is a die member '38 formed of a plurality'of segments 39. The

die member 38 has a central opening s ape which is substantially cylindrical in and is'adapted to receive the formingmember 18 and a forming member 42. Formed upon the segments 39 and projecting into the opening 40 are beads 44 which together 70 form a continuous bead around the opening 40. The angle of the wall of the tapered aperture 36 is greater than the maximum angle of static rest so that the die 38 may be readily removed from its. holder 34. 'Inter- I posed between the holder 34 and the base plate 15 is a collar 46 of rubber or any other suitableresilient material. The collar 46 coo crates with the collars 27 for a pu ose w 'ch willpresently appear.

S 'dably-journ'aled-in a bore 50 in the forming member 118 is a pin 52-having a head 53 which'is urged against a shoulder 55 formed in the bore, the head 52 being urged against the shoulder 53 by acomgression 'sprmg 58 interposed between the ead and a plug 60 threaded into the bore.

As shown in'Fig. 1, each pair of adjacent segments 39 have contiguous radially disposedsurfaces 62, one; surface 62 of each 90 segment being provided with a groove 63 adapted to receive matter. extruded or forced from the opening 40 through any clearance which must of necessity be allowed'between ticularly adapted to form spool shaped magcores. In the operation of the apparatus the forming member 42 is first withdrawn from the opening and a predetermined quantity of coated and finely divided 'magnetic material is placed in the opening, a metallic insert 65 being first placed in the bore in a manner illustrated in Fig. 2. The forming member 42 is then positioned in the opening 40 as illustrated in Fig. 2 and the hydraulic press is operated to urge the lower platen 11 toward the upper platen 10. This results in relative movement between the forming members 18 and 42 which are urged toward each other to apply pressure to the magnetic material disposed in the opening 40. As the magnetic material does not flow readily from that portion of the opening 40 above, to that below the beads 44, an annular groove is formed in the magnet core at a point substantially midway between its ends. The inner end of the insert remains in substantially the same position with -respect to the beads 44 throughout the pressing operation and is firmly-embedded in the magnet core at the completion 1 of the operation, the insert 65 being preferably knurled as at 66.

In practice it has been found that pressure exerted upon the segments'39 will cause the segments to be forced from their correct positions within the tapered aperture 36 unless means is provided to unbalance the pressures exerted by the forming members 18 and 42, it being readily apparent that unless the collars 27 and 46 are provided, the pressure exerted between the magnetic material by the lower surface of the forming member 42 will be substantially equal to the pressure exerted upon the magnetic material by the upper surface of the forming member 18. This withdrawal of the segments 39 from the tapered aperture 36 is prevented bythe resilient collars 27 and 46 which are compressed during the pressing operation in the manner illustrated in Fig. 3 to unbalance the pressures exerted by the forming members 42 and 18 to such an extent that the segments 39 do not withdraw from the tapered aperture 34. v This is because a greater pressure 1s then applied to the upper-surfaces of the beads 44 than is applied to the lower surfaces thereof.

When the required amount of pressure hasbeen applied to the magnetic material disposed in the opening 40, the lower platen 11 is lowered and the base plate 15 together with the apparatus carried by it is removed from the press. The forming member 42 is then removed from the opening 40 and the die 38 is removed from its holder 34, after which the segments 39 are separated from each other to permit removal of the completed magnet core.

What is claimed is:

' 1. Molding apparatus comprising a plurality of forming members, means or causing relative motion between the forming members to exert pressure on matter disposed between them, a die member cooperating with the forming members, and means for unbalancing the pressure applied to the matter to hold the die member in an opera-- tive position with respect to the forming members.

2. Molding apparatus comprising a forming member, a second forming member, means" for causing relative motion between the forming members, a die'member slidably engaging the forming members, and yielding means for holding the die -member in an operative position with respect to the forming members. 1

' 3. Molding apparatuscomprising a forming member, av second forming member, means for causing. relative motion between the forming members, a die member coop erating with the forming members, a second ing members, and yielding means for holding the die members in operative positions .die member also cooperating with the formwith respect to each other when the firstmentioned means, is efi'ective.

4. Molding apparatus comprising" a forming member, a second forming member, means for causing relative motion between the forming members, a die member slidably engaging the forming members,"a holder for the ,die member, and yielding means for preventing relative movement between the die member and its holder. 3

5. .Molding apparatus comprising'a forming member, a second forming member, means for causing relative motion between the forming members, a holder having a tapered aperture, a die member seated in the forming members, and yielding means interposed-between the holder and the first formin member for preventing relative movement between the die member and its holder.

6. Molding apparatus comprising a punch no I t-aperednperture and slidably engaging the posed between the holder and one of the forming members for resisting relative motion between the dieand its holder.

8. In apparatus for molding articles with inserts, a plurality of segmental die members, and yielding means for holding an insert in a predetermined position with respect to the die members.

- 9. In molding apparatus, an annular die member comprising a plurality of segments F having radial? dis osed surfaces, and having passages orme in said surfaces to receive matter extruded from the die during the operations of the forming apparatus.

In'witness whereof, I hereunto subscribe my name this 7th day of January A. D., 1925. WILLIAM STEVENS BUTTLES. 

